JP3352669B1 - Sandwich forming guide for transmission - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To be capable of injection molding without using a complicated mold and a manufacturing process, and to have both strong mechanical strength, excellent sliding contact and wear resistance, light weight and excellent durability. To provide a sandwich forming guide for a transmission. SOLUTION: In a sandwich forming guide 10 for a transmission device, which is composed of a slide rail body 11 on which a chain slides and runs and a rail support member 12 integrally attached to the slide rail body 11, the slide rail body 11 is resistant. A second polymer which is made of a material mainly composed of a first polymer material having abrasion resistance and heat resistance, wherein the rail support 12 has a higher strength than a material mainly composed of the first polymer material; The slide rail body 11 and the rail support body 12 are injection-molded by a sandwich molding method and are closely bonded to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission system such as a chain that circulates around a driving sprocket and a driven sprocket or a belt that circulates around a driving pulley and a driven pulley. It is used for a transmission device such as an automobile engine that transmits power by a medium. More specifically, a fixed guide that guides or tensions a power transmission medium such as a chain or a belt while running in a sliding contact state. Alternatively, the present invention relates to a plastic guide for a transmission device used as a movable guide.

[0002]

2. Description of the Related Art In general, a power transmission device such as an automobile engine that transmits power by a power transmission medium such as a chain or a belt includes a transmission guide such as a movable guide or a fixed guide for slidingly driving the power transmission medium. It is attached to a frame such as a block wall with mounting bolts and pins. In addition, a movable guide such as a tensioner lever used in such a transmission device has an appropriate transmission with respect to the power transmission medium in order to prevent a transmission failure due to excessive tension or looseness of the circulating traveling power transmission medium. A fixed guide such as a guide rail guides the power transmission medium along a predetermined traveling locus with respect to the power transmission medium in order to prevent vibration noise, lateral vibration, disengagement, etc. of the circulating power transmission medium. Regulating.

Therefore, a conventional plastic guide (tensioner lever) 100 for a transmission shown in FIGS.
Is formed of a single synthetic resin as a movable guide of a transmission using a chain as a power transmission medium. Such a plastic guide 100 for a transmission includes a slide rail body 101 that slides on a running chain C;
A rail support 102 is provided on the back side of the slide rail body 101 in the longitudinal direction.
The rail support 102 has a mounting hole 10 for mounting on an engine block wall to function as a movable guide.
3 and a tensioner (not shown) for contacting a tensioner (not shown) for applying a proper chain tension by preventing a transmission failure due to excessive tension or excessive slack of the circulating chain. Part 102b;
A reinforcing rib 102c having both a reinforcing function and weight reduction is formed.

[0004]

However, since the conventional plastic guide 100 for a transmission is integrally formed of a single synthetic resin, it can be used, for example, in a high temperature environment of about 200 ° C., such as an automobile engine. Sliding contact and abrasion resistance required for the slide rail body 101 with which the chain C slides below, and the slide rail body 101
It is difficult to maintain and maintain a high level of strength characteristics and the like required for the rail support 102 that supports the rails. For example, if the plastic guide 100 for a transmission is formed only of plastic having excellent sliding and abrasion resistance, the mechanical strength is inferior, and if the cross-sectional dimension is increased to compensate for the insufficient strength, the guide of the guide is reduced. There is a problem that the thickness increases and the size increases, and the occupied space when assembling to the engine block wall increases.

Therefore, as a plastic guide for a power transmission which solves the above-mentioned problems, a support made of a high-strength synthetic resin and a slide lining body made of a wear-resistant synthetic resin connected to the support are provided. And a slide rail (see Japanese Patent No. 2818795) in which one of these supports and the slide lining body is molded and the other is injection-molded is used as a mold. A chain tensioner formed by insert molding as a material (see Japanese Patent Application Laid-Open No. 8-254253) has been proposed, and further, a guide rail in which a slideway lining body is connected to a carrier by a fitting-type friction locking method (Japanese Patent Application Laid-Open No. 9-254253). 324839) and the like have been proposed.

However, the slide rail disclosed in the above-mentioned Japanese Patent No. 2818795 is a so-called two-piece type in which a support and a slide lining body are injection-molded using one of them as a mold. Because of the step molding, there is a problem that a groove forming portion must be formed in order to integrate the two synthetic resins, and the mold structure becomes complicated and the manufacturing cost increases.

In the chain tensioner disclosed in Japanese Patent Application Laid-Open No. 8-254253, there is a concern that the guide itself may be deformed or damaged due to a difference in thermal expansion coefficient between the core material made of the steel plate and plastic. However, there is a problem that it is difficult to achieve a reduction in weight because a core material of a steel plate is used.

Further, the guide rail disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-324839 is integrated with a previously manufactured slideway lining body and a carrier by a releasable fitting type friction locking system. Because
The manufacturing process becomes complicated, which is disadvantageous in terms of manufacturing cost, and there is a fear that the fitting-type frictionally locking portion may be damaged, and it is difficult to satisfy reliability and mechanical strength.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, and to easily perform injection molding with a single mold without using complicated molds and manufacturing steps. An object of the present invention is to provide a sandwich forming guide for a transmission, which has both strong mechanical strength and excellent sliding contact and wear resistance, and is lightweight and excellent in durability.

[0010]

According to a first aspect of the present invention, there is provided a sandwich forming guide for a power transmission device, comprising: a slide rail body on which a power transmission medium slides and travels; A sandwich forming guide for a power transmission device configured to guide or tension the power transmission medium, the slide rail body having a wear resistance and a heat resistance. A material mainly composed of a molecular material, wherein the rail support is made of a material mainly composed of a second polymer material having a higher strength than a material mainly composed of the first polymer material, The slide rail body and the rail support are injection-molded by a sandwich molding method and are integrated in a state where they are in close contact with each other. By being coated throughout with a material surface portion of the support is mainly composed of the first polymeric material is intended to solve the above problems.

According to a second aspect of the present invention, in addition to the structure of the first aspect of the present invention, the material having the second polymer material as a main component has a second height. The problem is solved by a composite material containing an inorganic material in a molecular material.

According to a third aspect of the present invention, in addition to the structure of the first aspect, the material mainly composed of the second polymer material has a long fiber reinforced height. The problem is solved by being a molecular material.

According to a fourth aspect of the present invention, there is provided a sandwich forming guide for a power transmission device, in addition to the configuration of the first aspect, wherein the first polymer material and the second high Since the molecular material is nylon 66,
It is intended to further solve the above-mentioned problem.

According to a fifth aspect of the present invention, there is provided a sandwich forming guide for a power transmission device, in addition to the configuration of the first aspect of the present invention, wherein the first polymer material and the second high The problem is further solved by the fact that the molecular material is nylon 6.

According to a sixth aspect of the present invention, there is provided a sandwich forming guide for a transmission device, wherein the first polymer material is nylon 46 in addition to the configuration of the first aspect of the present invention. The second polymer material is nylon 66
By doing so, the above problem is further solved.

According to a seventh aspect of the present invention, there is provided a sandwich forming guide for a power transmission device, in addition to the configuration of the first aspect of the invention. The object is further solved by the fact that the molecular material is wholly aromatic nylon.

Here, the sandwich molding method referred to in the present invention means that two types of molten polymer materials are simultaneously or almost simultaneously injection-molded into a mold simulating the outer shape of a molded product. Moldings made of high polymer materials, so-called,
This is a method for producing a two-layer molded product, and a known injection molding machine for sandwich molding can be used. In addition, the known sandwich molding injection molding machine is provided with various sandwich nozzles, but in the case of a sandwich molding injection molding machine equipped with a parallel sandwich nozzle, the inside of the parallel sandwich nozzle is Torpedo (ie, injection switching member between skin material and core material)
Can be finely controlled in accordance with the shape of the molded article by filling the two types of polymer materials.

The first polymer material and the second polymer material, which are the main constituent materials of the slide rail body and the rail support, are not particularly limited.
Those having a chemical affinity and no significant difference in shrinkage characteristics are preferable in that they are fused and satisfactorily adhered and joined at a boundary region between the two at the time of sandwich molding. Specific examples include polyamide resins selected from nylon 6, nylon 66, nylon 46, wholly aromatic nylon, and the like, which are commercially available under the trade name Nylon.

Then, a second part of the rail support is formed.
The second polymer material and the first polymer material having a higher strength than the material mainly containing the first polymer material constituting the slide rail body may be used as the second polymer material and the first polymer material. May be the same. In this case, the strength of the rail support is enhanced by dispersing and incorporating a long fiber or powdered inorganic compound in a material mainly composed of the second polymer material.

[0020]

According to the present invention, a slide rail body comprises a material mainly composed of a first polymer material having wear resistance and heat resistance, and a rail support body mainly composed of a second polymer material having strength. The first polymer material and the second polymer material are combined by adhesively fusing them together by a sandwich molding method. The high-strength property of the material mainly composed of is a complement to each other, and the two are integrally joined in a completely melted state. Etc., exhibit high strength properties that could not be achieved at all.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 relate to a sandwich forming guide 20 for a transmission device according to a first embodiment of the present invention, and FIG. 1 is a diagram for explaining a use mode of the present embodiment.
FIGS. 2A and 2B show a sandwich forming guide for a transmission device according to the present embodiment, wherein FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a bottom view. FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG.
FIG. 5 is a sectional view taken along line B-B, and FIG. 5 is a sectional view taken along line CC of FIG.

First, as shown in FIG. 1, a sandwich forming guide 20 for a transmission according to this embodiment is an automobile which transmits power by a chain C circulating around a driving sprocket S1 and a driven sprocket S2. It is used as a movable guide for guiding or tensioning such a chain C while running in a sliding contact state.

As shown in FIG. 2, the sandwich forming guide 20 for a transmission device of the present embodiment includes a slide rail body 21 having a substantially arc-shaped sliding contact surface 21a on the surface of which a circulating chain slides. A rail support 22 provided vertically on the back surface of the slide rail body 21 in the longitudinal direction.
2 has a boss portion 22a having a mounting hole 23 for mounting on an engine block wall to function as a movable guide.
A tensioner abutting portion 22b for abutting a tensioner (not shown) for applying a proper chain tension by preventing a transmission failure due to excessive tension or excessive slack of the circulating chain, and a reinforcing function And a reinforcing rib 22c which is lighter in weight.

The slide rail body 21 is made of a material mainly composed of a first polymer material having wear resistance and heat resistance. The first polymer material is made of nylon 6 or nylon 66. , Nylon 46 or wholly aromatic nylon. On the other hand, the rail support 22 is made of a material containing a second polymer material as a main component, and is made of a material such as nylon 6 or nylon 66 which is a second polymer material. It consists of a reinforced polymer material in which the material is dispersed and contained.

The slide rail body 21 and the rail support body 22 are formed by a sandwich molding method and are integrated in a state where they are in close contact with each other, and a surface layer portion of the slide rail body 21 and the rail support body 22 is formed. However, the entirety is covered with the same material as the main component of the first polymer material having abrasion resistance and heat resistance that constitutes the slide rail body 21.

In order to sandwich-mold such a structure, a single mold that simulates the outer shape of a guide molded product is used.
First, a material mainly composed of a first polymer material having abrasion resistance and heat resistance is injected from a sandwich nozzle of an injection molding machine for sandwich molding to form a surface layer portion of the entire outer shape of the guide molded product. Immediately after the formation of the surface layer portion, a long-fiber or a material mainly composed of a first polymer material having abrasion resistance and heat resistance and a second polymer material as a main component. Simultaneously inject two types of melted polymer materials consisting of a reinforced polymer material in which a particulate inorganic material is dispersed and contained, and slide the slide rail body 21 with a material mainly composed of the first polymer material. While forming
The rail support 22 is formed of a reinforced polymer material in which a long-fiber or particulate inorganic material is dispersed and contained in a material mainly composed of the second polymer material.

Therefore, the thus obtained sandwich forming guide 20 for the transmission of this embodiment is the first
The slide rail body 21 and the rail support 22 are further firmly joined by covering the entire surface layer portion of the slide rail body 21 and the rail support 22 with a material mainly composed of the polymer material described above. be able to. In addition, a boss 22a provided at one end of the rail support 22 for attachment to the engine block wall and a mounting hole 23 are provided.
The surface layer of is made of a material mainly composed of a first polymer material having abrasion resistance and heat resistance, so that it is suitable for a chain that is circulating and running too tight or too loose. As a rotatable movable guide for applying tension, it can function smoothly over a long period of time.

[0028]

As described above, the sandwich forming guide for a power transmission according to the present invention comprises a slide rail body made of a material mainly composed of a first polymer material having wear resistance and heat resistance. By using a material containing a second polymer material having strength as a main component for the support and integrally bonding them together by a sandwich molding method, for example, in a high temperature environment such as the interior of an automobile engine. Long-term compatibility between the sliding property and wear resistance required for the slide rail body with which the chain slides and the strength characteristics required for the rail support supporting this slide rail body at a high level A movable guide such as a tensioner lever for applying an appropriate transmission tension in the transmission, and a guide rail for restricting a predetermined traveling locus. It can be used as a fixed guide such.

The sandwich forming guide for a power transmission device of the present invention is formed by injection molding using a single forming die by a sandwich forming method to form a slide rail body, a rail support body, and a slide rail body. Each step of joining the rail and the rail support can be performed simultaneously or almost simultaneously in a single step, simplifying complicated manufacturing steps without the need for special molds as in the past, and reducing manufacturing costs. It can be significantly reduced. Further, since a core material or the like of a steel plate as in the related art is not required, the weight of parts substantially corresponding to the weight of the steel plate is reduced, and the fuel consumption of an internal combustion engine or the like used is improved.

Further, since the sandwich molding guide for a power transmission device of the present invention can simultaneously or almost simultaneously inject two kinds of molten polymer materials by injection molding by a sandwich molding method, two kinds of fusion molding materials can be used. The polymer materials that have been joined together in a completely melted state are integrally bonded and fused, so that the abrasion resistance and heat resistance of the material mainly composed of the first polymer material and the second polymer material are mainly used. The high strength characteristics of the material as a component can be exhibited complementarily to each other.

Further, the sandwich molding guide for a transmission according to the present invention simultaneously or almost simultaneously injects two types of molten polymer materials, and merges and integrates the two types of molten polymer materials in a completely molten state. A material mainly composed of the first polymer material and a material mainly composed of the second polymer material are subjected to abrasion resistance according to a high temperature environment condition such as inside an automobile engine. The properties and heat resistance and the high strength properties can be freely selected in consideration of the relationship.

Further, by covering the entire surface layer of the slide rail body and the rail support with a material mainly composed of the first polymer material, the slide rail body and the rail support can be further strengthened. The boss part provided at one end of the rail support for mounting to the engine block wall and the surface layer part of the mounting hole can be joined.
Since it is injection-molded with a material mainly composed of a first polymer material having abrasion resistance and heat resistance, in order to apply an appropriate chain tension to a chain that is circulating and running too much or too loose. Can smoothly function as a rotatable movable guide over a long period of time.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a use mode of the present invention.

2A and 2B show a sandwich forming guide for a transmission device according to an embodiment of the present invention, wherein FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a bottom view.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

FIG. 6 is a front view of a conventional movable guide.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a sectional view taken along line BB of FIG. 6;

[Explanation of symbols]

20: Sandwich forming guide (movable guide) for transmission device 21: Slide rail body 21a Slide contact surface 22 Rail support 22a Boss portion 22b Tensioner contact portion 22c Reinforcement Rib 23 ··· Mounting hole 40 ··· Sandwich forming guide (fixed guide) for transmission device 100 ··· Plastic guide (movable guide) for transmission device 101 ··· Slide rail body 102 ··· Rail support 102a ··· Boss portion 102b Tensioner contact portion 102c Reinforcement rib 103 Mounting hole C Chain S1 Drive sprocket S2 Driven sprocket T Tensioner X ... Boundary area

──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Yamawaki 3-3-20 Umeda, Kita-ku, Osaka City, Osaka Prefecture Inside Tsubakimoto Kogyo Co., Ltd. (72) Kozo Inoue 4--17 Tsurumi, Tsurumi-ku, Osaka City, Osaka Prefecture No. 96 Inside Tsubakimoto Chain Co., Ltd. (72) Osamu Ono 4-17, Tsurumi, Tsurumi-ku, Osaka City, Osaka Prefecture 96 Within Tsubakimoto Chain Co., Ltd. (56) References JP 2001-323976 (JP, A) JP 10-103435 (JP, A) JP-A-8-254253 (JP, A) JP-A-8-303541 (JP, A) JP-A-2000-266141 (JP, A) (58) Fields studied (Int. .7, DB name) F16H ^7/ 00-7/24

Claims (7)

(57) [Claims] 1. A power transmission device comprising a slide rail body on which a power transmission medium slides and travels and a rail support member integrally attached to the slide rail body to guide or tension the power transmission medium. In the sandwich forming guide, the slide rail body is made of a material mainly composed of a first polymer material having wear resistance and heat resistance, and the rail support is mainly composed of the first polymer material. The slide rail body and the rail support are injection-molded by a sandwich molding method, and are integrated in a state where they are in close contact with each other. And a surface layer portion of the slide rail body and the rail support is entirely covered with a material mainly composed of the first polymer material. That transmission apparatus for a sandwich molding guide. 2. The power transmission device according to claim 1, wherein the material containing the second polymer material as a main component is a composite material in which the second polymer material contains an inorganic material. Sandwich molding guide. 3. The guide according to claim 1, wherein the material mainly composed of the second polymer material is a long fiber reinforced polymer material. 4. The method according to claim 1, wherein the first polymer material and the second polymer material are nylon 66.
A sandwich forming guide for a transmission according to any one of claims 3 to 3. 5. The sandwich molding for a transmission according to claim 1, wherein the first polymer material and the second polymer material are nylon 6. guide. 6. The transmission according to claim 1, wherein the first polymer material is nylon 46, and the second polymer material is nylon 66. Sandwich molding guide for equipment. 7. The transmission device according to claim 1, wherein the first polymer material and the second polymer material are wholly aromatic nylon. Sandwich molding guide.